A155401 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,1 5,2 6,2 7,2 polyhexes in any orientation on a planar nXnXn triangular grid.

1, 7, 19, 64, 211, 828, 3688, 18091, 101434, 633477, 4772999, 40520506

Offset

7,2

Links

Table of n, a(n) for n=7..18.

Example

Maximal 10 X 10 X 10 example
............0
...........0.0
..........1.0.1
.........1.0.0.1
........1.0.0.0.1
.......0.1.0.0.1.0
......0.1.0.0.0.1.0
.....0.0.1.0.0.1.0.0
....0.0.1.0.0.0.1.0.0
...0.0.1.0.0.0.0.1.0.0

Crossrefs

Sequence in context: A092359 A259797 A155338 * A346851 A155384 A155218

Adjacent sequences: A155398 A155399 A155400 * A155402 A155403 A155404

Keyword

nonn

Author

R. H. Hardin Jan 22 2009

Status

approved